Internet lingo used to visualize the image of beating your head against the wall in frustration over something stupid someone has said over the internet.
Person A:
so today i was thinking, what if one day the earth gets really hot and remains at a high temperature so all the ice burgs melt and the earth floods? does anyone know if that is possible
Person B:
*headWALL*
in a nutshell, thats what global warming is.